Since this is an area for suggestions, So here's my suggestion to Quark to have someone look into and FIX this issue. I would very much appreciate a response on this topic from Quark.
When creating a table, snapping to guides does not work correctly.
For instance, I have a chart that I have created with 12 vertical columns. I have 8 columns that contain the exact same type of data (prices, with $xxx,xxx) in each column. So I drag guides 4 picas apart (exactly, using x,y's) from the start point to the end column. Then, view at 200% and snap each chart rule to the guides (maintain geometry is ON so the chart will not change in either width or height). Then I zoom in at 800% and see that some snapped to center, some snapped to right, and some snapped but missed the guide completely (so what DID they snap to?).
To test this issue, I have drawn rules in the quark layout that are not in a table. I snap these rules to the guides I previously dragged out. These snap to the center of the guide as before.
And yes, when printed, these guides do not match the guides that failed to snap from within the table.
Now, if in fact the table rules are not meant to snap to guides, fine. But stop them from APPEARING to snap to the guides. Someone may feel/see the "snap" and assume it actually DID SOMETHING ACCURATE within the quark file, when indeed IT DOES NOT.
Also, it would help tremendously if you could see the X,Y coordinates of the rules in the table when they are clicked ACTIVE. If nothing else, we could do the math and figure where they need to be within the table to align with items within the document if need be. That way we could make an item appear to be part of a table, when it is actually "under" the table.